I don't find this all that persuasive. For one, I'm not convinced that "pseudoscience chakra bullshit" isn't meditation, even though it obviously doesn't work t

I don't find this all that persuasive. For one, I'm not convinced that "pseudoscience chakra bullshit" isn't meditation, even though it obviously doesn't work the way those people say it does. There are also people who view exercise in an unscientific way or believe it will have unrealistic benefits, but that doesn't make exercise nebulous. To my understanding, we have done brain imaging on meditators and can see that the practice is reflected the brain, so just like you'd define exercise as something that strains a muscle, you might define meditation as something that induces a meditative brain state. I think you might be confusing lack of visibility, or difficulty of measurement, with indefinability.